p27

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LeetCode p27 Remove Element 题解

1.题目：

Given an array and a value, remove all instances of that value in place and return the new length.
Do not allocate extra space for another array, you must do this in place with constant memory.
The order of elements can be changed. It doesn’t matter what you leave beyond the new length.
Example:
Given input array nums = [3,2,2,3], val = 3
Your function should return length = 2, with the first two elements of nums being 2.

题意：

给一个数组，移除指定元素。并返回移除后的数组长度。

2.解题思路:

见代码

3.代码

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public class Solution {
    public int removeElement(int[] nums, int val) {
        int ans = nums.length;
		int t = 0;
		for (int a : nums) {
			if (a == val)
				ans--;
			else {
				nums[t] = a;
				t++;
			}
		}
		return ans;
    }
}

4.一些总结：